Flash Decompiler Trillix Mac (former SWF to FLA Converter) converts Adobe Flash SWF files back into FLA format and SWF files created in Flex back to Flex sources, which can be easily edited in native Flash or Flex environment.

Airy is a tiny but powerful YouTube downloader Mac app that can download videos from YouTube and save them as various file types in various resolutions. You can also extract MP3 sounds from YouTube videos.

Away3D is a realtime 3D engine for Flash in ActionScript 3.0, originally derived from Papervision3D. Away3D engine is designed to be fast and extensible. Away3D = Amazing Games, Websites and Applications

Starling is an Open Source Game Engine for Flash. Download and use it right away - no strings attached. And because it is Open Source, you're always in control: step through the code and learn from its internals. Everything is well documented and easy to understand. Drop your in-house engine and focus on your games!